Creating a More Inclusive and Sustainable Future
Cost-Saving Synergy: Energy Stacking in Battery Energy Storage Systems
Management Science
Despite the great potential benefits of battery energy storage systems (BESSs) to electrical grids, most standalone uses of BESS are not economical due to batteries’ high upfront costs and limited lifespans. Energy stacking, a strategy of providing two or more services with a single BESS, has been of great interest to improve profitability. However, some key questions, for example, the underlying mechanism by which stacking works or why and how much it may improve profitability, remain unanswered in the literature. Using two popular battery services, we analytically show that there often exists cost-saving synergy -- the cost of performing both services at the same time (simultaneous stacking) is smaller than the sum of individual costs if we had performed each service alone -- which allows for bigger profits. Furthermore, we perform comparative statics on the optimal mix of the services to systemically characterize grid/market conditions that maximize/minimize this synergy. We also derive a theoretical upper bound on simultaneous stacking’s benefits, showing that it can approximately double the profit of the best standalone service. Several generalizations of the base model not only show that the main lessons continue to hold but also that stacking’s benefits may become even stronger.
Joonho Bae (Indiana University), Roman Kapuscinski (University of Michigan), John Silberholz (UMD)
Unlocking Forecast Quality: The Power of Material Sustainability Disclosures
Accounting and Business Research
In 2013, the Sustainability Accounting Standards Board (SASB) began releasing guidelines to identify material (or financially relevant) sustainability metrics. This study investigates the effects of material and immaterial sustainability activities on analyst forecast error and dispersion. We further examine how these effects are influenced by the issuance of stand-alone sustainability reports and the release of SASB’s material sustainability standards. Using a sample of US firms from 2005 to 2018, we find that material sustainability activities are associated with more accurate and less dispersed analyst forecasts when firms issue stand-alone sustainability reports. Among firms that do not release such reports, material sustainability activities improve forecast quality only after the initial release of the SASB standards. Immaterial sustainability activities appear to add noise to information in the financial market and confound earnings forecasts, especially during the pre-SASB period, but this confounding effect reverses in the post-SASB period. Overall, our findings provide empirical evidence that classifying and disclosing corporate sustainability activities yield economic and informational benefits in capital markets.
Sue A. Cooper PhD EA CMA MEd MBA, Visiting Associate Clinical Professor of Accounting, University of Maryland, College Park, and Jennifer Yin PhD, Professor of Accounting, University of Texas at San Antonio, and Harrison Liu PhD, Associate Professor of Accounting University of Texas at San Antonio
Effects of Greenhouse Gas Emissions and Climate Change Policy on Audit Fees
Accounting and the Public Interest, December 2025
This study explores the correlation between greenhouse gas (GHG) emissions from U.S. companies and their audit fees, driven by the escalating frequency and intensity of extreme weather events. Building on prior research that connects climate risk, regulation, and audit fees, our investigation uses a sample of companies with Scope 1 GHG emissions sourced from the U.S. Environmental Protection Agency’s (EPA’s) Greenhouse Gas Reporting Program (GHGRP). Our results show a positive association between GHG emissions and audit fees. Additionally, we find that regulatory uncertainty surrounding U.S. climate policy intensifies this relationship. Our findings are robust to alternate model and variable specifications. This research benefits managers and policymakers by highlighting some of the financial consequences of corporate GHG emissions, especially when combined with inconsistent climate policies. It is also beneficial to accountants in practice or researchers interested in refining their audit fee models.
Sue A. Cooper PhD EA CMA MEd MBA, Visiting Associate Clinical Professor, University of Maryland, College Park, and Jared B. Cooper MEd, Certified MD Educator, Wicomico County Board of Education